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Subject[PATCH v2 1/8] vhost: Create accessors for virtqueues private_data
Date
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
drivers/vhost/net.c | 28 +++++++++++++++-------------
drivers/vhost/vhost.h | 28 ++++++++++++++++++++++++++++
drivers/vhost/vsock.c | 14 +++++++-------
3 files changed, 50 insertions(+), 20 deletions(-)

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index e158159671fa..6c5e7a6f712c 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -424,7 +424,7 @@ static void vhost_net_disable_vq(struct vhost_net *n,
struct vhost_net_virtqueue *nvq =
container_of(vq, struct vhost_net_virtqueue, vq);
struct vhost_poll *poll = n->poll + (nvq - n->vqs);
- if (!vq->private_data)
+ if (!vhost_vq_get_backend_opaque(vq))
return;
vhost_poll_stop(poll);
}
@@ -437,7 +437,7 @@ static int vhost_net_enable_vq(struct vhost_net *n,
struct vhost_poll *poll = n->poll + (nvq - n->vqs);
struct socket *sock;

- sock = vq->private_data;
+ sock = vhost_vq_get_backend_opaque(vq);
if (!sock)
return 0;

@@ -524,7 +524,7 @@ static void vhost_net_busy_poll(struct vhost_net *net,
return;

vhost_disable_notify(&net->dev, vq);
- sock = rvq->private_data;
+ sock = vhost_vq_get_backend_opaque(rvq);

busyloop_timeout = poll_rx ? rvq->busyloop_timeout:
tvq->busyloop_timeout;
@@ -570,8 +570,10 @@ static int vhost_net_tx_get_vq_desc(struct vhost_net *net,

if (r == tvq->num && tvq->busyloop_timeout) {
/* Flush batched packets first */
- if (!vhost_sock_zcopy(tvq->private_data))
- vhost_tx_batch(net, tnvq, tvq->private_data, msghdr);
+ if (!vhost_sock_zcopy(vhost_vq_get_backend_opaque(tvq)))
+ vhost_tx_batch(net, tnvq,
+ vhost_vq_get_backend_opaque(tvq),
+ msghdr);

vhost_net_busy_poll(net, rvq, tvq, busyloop_intr, false);

@@ -685,7 +687,7 @@ static int vhost_net_build_xdp(struct vhost_net_virtqueue *nvq,
struct vhost_virtqueue *vq = &nvq->vq;
struct vhost_net *net = container_of(vq->dev, struct vhost_net,
dev);
- struct socket *sock = vq->private_data;
+ struct socket *sock = vhost_vq_get_backend_opaque(vq);
struct page_frag *alloc_frag = &net->page_frag;
struct virtio_net_hdr *gso;
struct xdp_buff *xdp = &nvq->xdp[nvq->batched_xdp];
@@ -952,7 +954,7 @@ static void handle_tx(struct vhost_net *net)
struct socket *sock;

mutex_lock_nested(&vq->mutex, VHOST_NET_VQ_TX);
- sock = vq->private_data;
+ sock = vhost_vq_get_backend_opaque(vq);
if (!sock)
goto out;

@@ -1121,7 +1123,7 @@ static void handle_rx(struct vhost_net *net)
int recv_pkts = 0;

mutex_lock_nested(&vq->mutex, VHOST_NET_VQ_RX);
- sock = vq->private_data;
+ sock = vhost_vq_get_backend_opaque(vq);
if (!sock)
goto out;

@@ -1344,9 +1346,9 @@ static struct socket *vhost_net_stop_vq(struct vhost_net *n,
container_of(vq, struct vhost_net_virtqueue, vq);

mutex_lock(&vq->mutex);
- sock = vq->private_data;
+ sock = vhost_vq_get_backend_opaque(vq);
vhost_net_disable_vq(n, vq);
- vq->private_data = NULL;
+ vhost_vq_set_backend_opaque(vq, NULL);
vhost_net_buf_unproduce(nvq);
nvq->rx_ring = NULL;
mutex_unlock(&vq->mutex);
@@ -1528,7 +1530,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
}

/* start polling new socket */
- oldsock = vq->private_data;
+ oldsock = vhost_vq_get_backend_opaque(vq);
if (sock != oldsock) {
ubufs = vhost_net_ubuf_alloc(vq,
sock && vhost_sock_zcopy(sock));
@@ -1538,7 +1540,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
}

vhost_net_disable_vq(n, vq);
- vq->private_data = sock;
+ vhost_vq_set_backend_opaque(vq, sock);
vhost_net_buf_unproduce(nvq);
r = vhost_vq_init_access(vq);
if (r)
@@ -1575,7 +1577,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
return 0;

err_used:
- vq->private_data = oldsock;
+ vhost_vq_set_backend_opaque(vq, oldsock);
vhost_net_enable_vq(n, vq);
if (ubufs)
vhost_net_ubuf_put_wait_and_free(ubufs);
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index a123fd70847e..0808188f7e8f 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -244,6 +244,34 @@ enum {
(1ULL << VIRTIO_F_VERSION_1)
};

+/**
+ * vhost_vq_set_backend_opaque - Set backend opaque.
+ *
+ * @vq Virtqueue.
+ * @private_data The private data.
+ *
+ * Context: Need to call with vq->mutex acquired.
+ */
+static inline void vhost_vq_set_backend_opaque(struct vhost_virtqueue *vq,
+ void *private_data)
+{
+ vq->private_data = private_data;
+}
+
+/**
+ * vhost_vq_get_backend_opaque - Get backend opaque.
+ *
+ * @vq Virtqueue.
+ * @private_data The private data.
+ *
+ * Context: Need to call with vq->mutex acquired.
+ * Return: Opaque previously set with vhost_vq_set_backend_opaque.
+ */
+static inline void *vhost_vq_get_backend_opaque(struct vhost_virtqueue *vq)
+{
+ return vq->private_data;
+}
+
static inline bool vhost_has_feature(struct vhost_virtqueue *vq, int bit)
{
return vq->acked_features & (1ULL << bit);
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index c2d7d57e98cf..6e20dbe14acd 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -91,7 +91,7 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,

mutex_lock(&vq->mutex);

- if (!vq->private_data)
+ if (!vhost_vq_get_backend_opaque(vq))
goto out;

/* Avoid further vmexits, we're already processing the virtqueue */
@@ -440,7 +440,7 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)

mutex_lock(&vq->mutex);

- if (!vq->private_data)
+ if (!vhost_vq_get_backend_opaque(vq))
goto out;

vhost_disable_notify(&vsock->dev, vq);
@@ -533,8 +533,8 @@ static int vhost_vsock_start(struct vhost_vsock *vsock)
goto err_vq;
}

- if (!vq->private_data) {
- vq->private_data = vsock;
+ if (!vhost_vq_get_backend_opaque(vq)) {
+ vhost_vq_set_backend_opaque(vq, vsock);
ret = vhost_vq_init_access(vq);
if (ret)
goto err_vq;
@@ -547,14 +547,14 @@ static int vhost_vsock_start(struct vhost_vsock *vsock)
return 0;

err_vq:
- vq->private_data = NULL;
+ vhost_vq_set_backend_opaque(vq, NULL);
mutex_unlock(&vq->mutex);

for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
vq = &vsock->vqs[i];

mutex_lock(&vq->mutex);
- vq->private_data = NULL;
+ vhost_vq_set_backend_opaque(vq, NULL);
mutex_unlock(&vq->mutex);
}
err:
@@ -577,7 +577,7 @@ static int vhost_vsock_stop(struct vhost_vsock *vsock)
struct vhost_virtqueue *vq = &vsock->vqs[i];

mutex_lock(&vq->mutex);
- vq->private_data = NULL;
+ vhost_vq_set_backend_opaque(vq, NULL);
mutex_unlock(&vq->mutex);
}

--
2.18.1
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